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Diamonds for Everyone

About Diamond Color

The Best Kept Secret : Colored Diamonds Most people have never even heard of coloured diamonds. Almost all of the publicity and advertising for diamonds is slanted towards convincing consumers that white, or more accurately colourless, is the only desirable colour for diamonds, and that diamonds with a slight tinge of yellow or brown are less attractive and therefore less desirable. While we would broadly agree with this, diamonds do occur in a wide variety of colours. Many of these colours are very attractive and the diamonds are even more desirable than colourless ones. This is especially true of intensely coloured diamonds. Coloured Diamonds Are Very Rare! Probably the main reason why coloured diamonds are hardly ever promoted is the very fact that they are so rare. Why bother to promote something with a very limited supply that you can’t get enough of? De Beers, who own or control about half the world’s diamond mines and marketing, have their own collection of natural fancy coloured diamonds, which they keep for themselves, and which are not for sale. It might even be harmful to their marketing if consumers decided that coloured stones were more interesting and exciting than colourless ones. About Diamond Color The color of a diamond refers to the tone and saturation of color, or the depth of color in a diamond. The color of a diamond can range from colorless to a yellow or brown hue. A more colorless diamond is rarer and more valuable because it appears white and brighter to the eye. The most respected system used today for evaluating diamond color was developed by the Gemological Institute of America, (GIA). Color Scale Even though there are several grades in each category, there are slight differences between the letter grades. D is the clearest and most valuable, X is a dingy yellow and least expensive. Z grade-colored diamonds are the rarest and most expensive. A diamond so saturated with nitrogen that it becomes a deep, rich yellow is as rare as a colorless diamond. Weight Diamonds are weighed on an extremely accurate digital balance. One carat equals 100 points, which weigh 1/5 gram. Proportions The items in this category relate to the cut (or make) of the diamond: Proportions The items in this category relate to the cut (or make) of the diamond: Depth Percentage: The relationship between the depth and the average diameter of a diamond. Table: The relationship between the table (flat, top facet) and the average diameter. Girdle: Describes the variance and relative width at minimum and maximum positions. The girdle is the rim that separates the top and the bottom of the diamond. Culet: The bottom facet of a diamond as viewed through the table. Polish: Refers to the quality of the surface of a diamond. Symmetry: General comment regarding the symmetry of the diamond. Diamond Proportion The fixed proportions have the following reference values: Crown angle = 34° Pavilion angle = 40.5° Table size = 56% Star facet length (percentage of total distance from table to girdle) = 50% Lower-girdle facet length length (percentage of total distance from girdle to culet) = 75% Girdle thickness (at the thickest point) = 3% Culet size = 0.5% Ideal Parameters Carat Size: 1/2 carat (.50 points) or larger Color: D-H Clarity: Slightly Included Two (SI2) or better Depth: 56-62% Table: 52-62% Girdle: Minimum Variations, No Extremely Thin or Extremely Thick Culet: None, Small or Medium Polish and Symmetry: Good or better Fluorescence: None or blue is fine. Stay away from orange, yellow, and green. CLARITY GRADE–COLOR GRADE–ANNUAL INCREASE IN $ VALUE FLAWLESS AND INTERNALLY FLAWLESS: D (Perfect) — 10.00% E (Low) VVS1, VVS2: D (High) E (Perfect) — 9.25% F (Low) VS1, VS2: F (High) G (Perfect) — 8.50%v H (Low) SI1, SI2: H (High) I (Perfect) — 6.50% J (Low) Lower: No corresponding color grades Clarity Clarity refers to the summation of the number, size and placement as well as the nature of inclusions and/or surface irregularities. Flawless stones are diamonds free of inclusions under 10 power. Internally flawless are diamonds without any internal inclusions. VVS1 and VVS2 have extremely small inclusions. VS1 and VS2 possess small inclusions. SI1 and SI2 have inclusions that can be seen easily under 10 power magnification, but are not usually visible to the naked eye. Fluorescence Fluorescence is a diamond’s reaction to ultraviolet (UV) light. Some diamonds glow in different colors under UV light, and the general rule is to avoid them. If you put a diamond under UV light and it glows strong blue, the diamond may look dull in the sunlight. Diamonds with strong fluorescence may be worth up to 20% less than diamonds which do not fluoresce. Faint fluorescence which doesn’t fog the diamond is OK. Huge amount of information on Color of Diamonds pls. visit our web site: http://djewels.org/diamondscoloured_djewels.asp

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